Inorganic enhanced electronic cigarette oil guide rope and preparation method thereof

Abstract

The invention discloses an inorganic enhanced electronic cigarette oil guide rope and a preparation method thereof, and relates to the technical field of oil guide ropes. The nano aluminum oxide particles and the polyester fibers are blended to prepare the low-fiber-density core layer oil guide cotton, a large amount of tobacco tar can be stored, and the problem of carbon deposition is effectively relieved; the high-density glass fiber oil guide cotton is adopted as the outer layer, so that a directional oil guide channel is formed while the mechanical strength is ensured, and the effects of large oil storage quantity and high oil guide speed are achieved; the outer layer oil guide cotton is coated with the modified coating liquid and bonded to the periphery of the core layer to prepare the oil guide rope of the electronic cigarette, integration of a double-layer structure is achieved, and the oil guide performance of the outer layer is improved. The modified coating liquid is doped with ammonium carbonate when titanium dioxide is prepared through a hydrothermal method, porous titanium dioxide is formed, the tar guiding efficiency is improved, meanwhile, the existence of ammonium ions can adjust the acidity and alkalinity of tobacco tar, and the service life of the tar guiding rope is prolonged; and then forming a coating liquid with fluorocarbon resin, so that the adhesive force of the coating and the oil guide cotton is enhanced, and the overall mechanical property is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of oil guiding ropes, and in particular to an inorganic reinforced e-cigarette oil guiding rope and a preparation method thereof. Background Art

[0002] An e-cigarette heats a vape juice containing nicotine and other additives to produce an aerosol for inhalation, simulating the smoking experience of traditional cigarettes. In the structure of an e-cigarette, the oil guiding rope plays a crucial role. It is responsible for transporting the vape juice from the oil storage chamber to the heating element to achieve continuous supply and atomization of the vape juice. However, currently, the e-cigarette oil guiding ropes on the market generally have a series of performance problems, seriously affecting the use experience and product quality of e-cigarettes. Due to the unreasonable material and structural design of the oil guiding rope, the transmission speed of the vape juice inside the oil guiding rope is slow, unable to meet the demand of the heating element for vape juice in a timely manner. This leads to insufficient atomization and poor taste during the user's inhalation process, and may even cause dry burning. Not only does it damage the heating element, but it also produces a pungent odor, greatly reducing the user's favorability towards e-cigarettes.

[0003] At the same time, a smaller vape juice storage capacity means that users need to frequently refill the vape juice, which brings inconvenience to use. Especially for some users who need to go out for a long time or are in special scenarios, frequent refueling may cause the use to be interrupted, affecting their use experience. In addition, increasing the volume of the oil guiding rope in order to pursue a larger vape juice storage capacity may face problems in adapting to the internal structure space of the e-cigarette, restricting the design innovation of the product. Moreover, during the operation of the e-cigarette, the high temperature of the heating element will cause some components in the vape juice to undergo a carbonization reaction, and these carbides will gradually accumulate on the surface and internal pores of the oil guiding rope. Carbon deposition not only hinders the normal transmission of the vape juice, further reducing the oil guiding efficiency, but also affects the taste and flavor of the vape juice, making the inhalation experience worse. At the same time, when the carbon deposition is severe, it may also cause the oil guiding rope to be blocked, forcing the heating element to dry burn, shortening the service life of the e-cigarette and increasing the user's usage cost. In addition to the above carbon deposition problem accelerating the aging of the oil guiding rope, the oil guiding rope is long-term soaked in the vape juice and will also be eroded by the chemical components in the vape juice, resulting in a decline in material performance, thus affecting its oil guiding and oil storage capabilities. Frequent replacement of the oil guiding rope not only increases the user's operation cost and time cost, but also is not conducive to the sustainable development of the product, causing certain pressure on the environment. Summary of the Invention

[0004] The purpose of the present invention is to provide an inorganic reinforced e-cigarette oil guiding rope and a preparation method thereof to solve the problems existing in the prior art.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: An inorganic enhanced e-cigarette oil guiding rope, the inorganic enhanced e-cigarette oil guiding rope includes a core layer and an outer layer; the core layer is a low fiber density oil guiding rope prepared by blending nano-aluminum oxide and polyester fiber; the outer layer is a high density glass fiber oil guiding rope coated with a modified coating liquid.

[0006] Further, the modified coating liquid is prepared by doping ammonium carbonate when preparing titanium dioxide by the hydrothermal method to form porous titanium dioxide, and then mixing it with fluorocarbon resin.

[0007] Further, a preparation method of an inorganic enhanced e-cigarette oil guiding rope includes the following preparation steps:

[0008] (1) Disperse 5-25 parts of nano-aluminum oxide in 100-2500 parts of polyethylene terephthalate melt, spin it into fibers with a single filament diameter of 5-20 μm, wind them into an oil guiding rope with a porosity of 60-80% and a diameter of 2-4 mm, and dry it at 60-80 °C for 24-36 h to obtain the core layer oil guiding rope;

[0009] (2) Disperse 1-10 parts of glass fiber in 10-1000 parts of polypropylene melt with a molecular weight of 40000-50000 g / mol, spin it into fibers with a single filament diameter of 15-35 μm, wind them into an oil guiding rope with a porosity of 30-40% and a diameter of 0.3-0.5 mm, and dry it at 60-80 °C for 24-36 h to obtain the outer layer oil guiding rope;

[0010] (3) Inject the modified coating liquid into the coating tank, place the outer layer oil guiding rope on the roller shaft, coat it at a coating speed of 5-15 m / min, a roller pressure of 0.2-0.6 MPa, and a coating thickness of 10-30 μm. Then, in a nitrogen atmosphere, cure it at 80-100 °C for 2-3 min, and then raise the temperature to 150-180 °C and continue to cure for 5-9 min to obtain the modified outer layer oil guiding rope;

[0011] (4) Wind the modified outer layer oil guiding rope around the periphery of the core layer oil guiding rope, bond it at a pressure of 0.3-0.6 MPa with a hot pressing roller at 120-150 °C at a speed of 5-10 m / min, cool it, and cut it to obtain the inorganic enhanced e-cigarette oil guiding rope.

[0012] Further, the particle size of the nano-aluminum oxide in step (1) is 20-50 nm.

[0013] Further, the molecular weight of the polyethylene terephthalate in step (1) is 45000-55000 g / mol.

[0014] Further, the diameter of the glass fiber in step (2) is 3-10 μm.

[0015] Further, the preparation steps of the modified coating liquid in step (3) are as follows: Mix 40 - 60 parts of 60wt% polytetrafluoroethylene emulsion with 30 - 40 parts of absolute ethanol evenly, add 3 - 5 parts of porous titanium dioxide and 1 - 2 parts of PEG - 400 dispersant, perform ultrasonic dispersion at 40kHz for 20 - 30min, and filter with a 5μm filter screen to obtain the modified coating liquid.

[0016] Further, the preparation steps of the porous titanium dioxide are as follows: Drop 5 - 15 parts of tetrabutyl titanate into 60 parts of absolute ethanol at a rate of 2mL / min, adjust the pH of the solution to 2 - 4, drop 10 parts of 20wt% ammonium carbonate aqueous solution at a rate of 2 drops / s, stir at 80rpm for 20 - 40min, transfer to a reaction kettle, react at 120 - 200°C for 6 - 24h, naturally cool to room temperature, centrifuge in a centrifuge at 8000rpm for 5min, collect the solid, wash it alternately with deionized water and ethanol 3 times, and dry it in an oven at 50 - 60°C for 12 - 18h to obtain porous titanium dioxide.

[0017] Further, the reagent used for pH adjustment is 0.2mol / L dilute hydrochloric acid.

[0018] Further, the conditions for cooling in step (4) are: cooling air temperature 15 - 25°C, wind speed 10 - 20m / s, wind pressure 0.1 - 0.3MPa, and cooling time 10 - 30s.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0020] In the present invention, nano - alumina particles are blended with polyester fibers to form a core - layer oil - guiding cotton with a low fiber density. The structure is arranged loosely, has a high porosity, and can store a large amount of e - liquid, providing guarantee for continuous combustion, thus effectively alleviating the carbon deposition problem caused by insufficient oil supply. On this basis, a high - density glass fiber oil - guiding cotton is used as the outer layer. By optimizing the fiber weaving density and orientation, while ensuring mechanical strength, a directional oil - guiding channel is formed, reducing e - liquid retention. At the same time, the oil stored in the core layer continuously penetrates outward under the action of capillary force and the pressure difference between the inner and outer layers, and the outer layer exports the oil at a stable speed according to its own structural characteristics, thus achieving the effects of large oil storage capacity and fast oil - guiding speed. Furthermore, after the outer - layer oil - guiding cotton is coated with the modified coating liquid and bonded to the periphery of the core layer to obtain an e - cigarette oil - guiding rope, the adhesion of the coating liquid is used to realize the integration of the double - layer structure, and at the same time, the oil - guiding performance of the outer layer is further improved through coating functionalization.

[0021] The modified coating liquid forms porous titanium dioxide by doping ammonium carbonate during the hydrothermal preparation of titanium dioxide. It has numerous tiny capillary channels, which can adsorb more e-liquid, improve the e-liquid guiding efficiency, and ensure that the e-liquid can be continuously and stably supplied to the combustion area. At the same time, the presence of ammonium ions can adjust the acidity and alkalinity of the e-liquid, prevent the corrosion of the e-liquid guiding rope by the e-liquid, and ensure the service life of the e-liquid guiding rope. Then it forms a coating liquid with fluorocarbon resin, increasing the surface area of the coating, enabling the fluorocarbon resin to better penetrate and adhere, enhancing the adhesion between the coating and the e-liquid guiding cotton, and enhancing the overall mechanical properties. Detailed implementation mode

[0022] The following will combine the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] In order to more clearly illustrate the method provided by the present invention, the following embodiments are used for detailed description. The test methods for each index of the inorganic enhanced e-liquid guiding rope made in the following embodiments are as follows:

[0024] Oil storage rate: Take the examples and comparative examples of the same length, weigh them, and record as W0. Use standard e-liquid (viscosity about 30 mPa·s at 25°C), completely immerse the e-liquid guiding rope in the e-liquid, let it stand for 30 minutes until saturated, take out the e-liquid guiding rope, hang it vertically to drain for 5 minutes, weigh it, and record as W1. Calculate according to the oil storage rate = (W1 - W0) / W0 × 100%.

[0025] E-liquid guiding speed: Take the examples and comparative examples of the same length. At 25°C and 50% humidity, vertically fix the e-liquid guiding rope (length 10 cm), immerse the bottom in the e-liquid pool (liquid level height 1 cm), and use a high-speed camera or optical sensor to monitor the front of the rising e-liquid, and record the time from contacting the e-liquid to the top being completely wetted.

[0026] Carbon deposition rate: Take the examples and comparative examples of the same mass, weigh them, and record as W0. Install them on the atomizer, set the power of the heating wire to the rated maximum value (30 W), and under the state of no e-liquid, continuously pulse heat (5 s each time, interval 10 s), heat 50 times, disassemble the e-liquid guiding rope, weigh the mass of the carbonized part, and record as C. Calculate according to the carbon deposition rate = (C / W0) × 100%.

[0027] Number of cycles: Take the examples and comparative examples of the same length, and test according to refueling, atomization (power 10 - 15 W, each puff for 3 s, interval 30 s), exhausting the e-liquid, and repeating refueling, and record the number of cycles until the performance deteriorates (the e-liquid guiding speed drops by 20% or there is liquid leakage).

[0028] Example 1

[0029] (1) Disperse 5 parts of nano-aluminum oxide with a particle size of 20 nm in 100 parts of polyethylene terephthalate melt with a molecular weight of 45,000 g / mol, spin into fibers with a single filament diameter of 5 μm, wind into an oil guide rope with a porosity of 60% and a diameter of 2 mm, and dry at 60 °C for 24 h to obtain the core layer oil guide rope;

[0030] (2) Disperse 1 part of glass fiber with a diameter of 3 μm in 10 parts of polypropylene melt with a molecular weight of 40,000 g / mol, spin into fibers with a single filament diameter of 15 μm, wind into an oil guide rope with a porosity of 30% and a diameter of 0.3 mm, and dry at 60 °C for 24 h to obtain the outer layer oil guide rope;

[0031] (3) Drop 5 parts of tetrabutyl titanate into 60 parts of absolute ethanol at a rate of 2 mL / min, adjust the pH of the solution to 2 with 0.2 mol / L dilute hydrochloric acid, drop 10 parts of 20 wt% ammonium carbonate aqueous solution at a rate of 2 drops / s, stir at 80 rpm for 20 min, transfer to a reaction kettle, react at 120 °C for 6 h, naturally cool to room temperature, place in a centrifuge and centrifuge at 8000 rpm for 5 min, collect the solid, wash alternately with deionized water and ethanol 3 times, and dry in an oven at 50 °C for 12 h to obtain porous titanium dioxide;

[0032] (4) Mix 40 parts of 60 wt% polytetrafluoroethylene emulsion and 30 parts of absolute ethanol evenly, add 3 parts of porous titanium dioxide and 1 part of PEG-400 dispersant, disperse by ultrasonic wave at 40 kHz for 20 min, and filter with a 5 μm filter screen to obtain the modified coating liquid;

[0033] (5) Inject the modified coating liquid into the coating tank, place the outer layer oil guide rope on the roller shaft, coat at a coating speed of 5 m / min, an inter-roll pressure of 0.2 MPa, and a coating thickness of 10 μm, and then cure at 80 °C for 2 min in a nitrogen atmosphere, and then raise the temperature to 150 °C and continue to cure for 5 min to obtain the modified outer layer oil guide rope;

[0034] (6) Wind the modified outer layer oil guide rope around the periphery of the core layer oil guide rope, bond at a pressure of 0.3 MPa with a hot press roller at 120 °C at a speed of 5 m / min, cool for 10 s at a cooling air temperature of 15 °C, a wind speed of 10 m / s, and a wind pressure of 0.1 MPa, and cut to obtain the inorganic reinforced e-cigarette oil guide rope.

[0035] Example 2

[0036] (1) Disperse 15 parts of nano-aluminum oxide with a particle size of 35 nm in 1300 parts of polyethylene terephthalate melt with a molecular weight of 50000 g / mol, spin to make fibers with a single fiber diameter of 13 μm, wind them into an oil guiding rope with a porosity of 70% and a diameter of 3 mm, and dry at 70 °C for 30 h to obtain the core layer oil guiding rope;

[0037] (2) Disperse 5 parts of glass fibers with a diameter of 7 μm in 500 parts of polypropylene melt with a molecular weight of 45000 g / mol, spin to make fibers with a single fiber diameter of 25 μm, wind them into an oil guiding rope with a porosity of 35% and a diameter of 0.4 mm, and dry at 70 °C for 30 h to obtain the outer layer oil guiding rope;

[0038] (3) Drop 10 parts of tetrabutyl titanate into 60 parts of absolute ethanol at a rate of 2 mL / min, adjust the pH of the solution to 3 with 0.2 mol / L dilute hydrochloric acid, drop 10 parts of 20 wt% ammonium carbonate aqueous solution at a rate of 2 drops / s, stir at 80 rpm for 30 min, transfer to a reaction kettle, react at 160 °C for 15 h, naturally cool to room temperature, place in a centrifuge and centrifuge at 8000 rpm for 5 min, collect the solid, wash it alternately with deionized water and ethanol 3 times, and dry it in an oven at 55 °C for 15 h to obtain porous titanium dioxide;

[0039] (4) Mix 50 parts of 60 wt% polytetrafluoroethylene emulsion and 35 parts of absolute ethanol evenly, add 4 parts of porous titanium dioxide and 1.5 parts of PEG-400 dispersant, disperse ultrasonically at 40 kHz for 25 min, and filter with a 5 μm filter screen to obtain a modified coating solution;

[0040] (5) Inject the modified coating solution into a coating tank, place the outer layer oil guiding rope on a roller, coat it at a coating speed of 10 m / min, a roller pressure of 0.4 MPa, and a coating thickness of 20 μm, and then cure it in a nitrogen atmosphere at 90 °C for 2.5 min and then raise the temperature to 165 °C and continue to cure for 7 min to obtain a modified outer layer oil guiding rope;

[0041] (6) Wind the modified outer layer oil guiding rope around the periphery of the core layer oil guiding rope, bond it at a pressure of 0.45 MPa and a speed of 7.5 m / min with a hot pressing roller at 135 °C, cool it for 20 s at a cooling air temperature of 20 °C, a wind speed of 15 m / s, and a wind pressure of 0.2 MPa, and cut it to obtain an inorganic reinforced e-cigarette oil guiding rope.

[0042] Example 3

[0043] (1) Disperse 25 parts of nano-aluminum oxide with a particle size of 50 nm in 2500 parts of polyethylene terephthalate melt with a molecular weight of 55000 g / mol, spin it into fibers with a single filament diameter of 20 μm, wind them into an oil guide rope with a porosity of 80% and a diameter of 4 mm, and dry it at 80 °C for 36 h to obtain a core layer oil guide rope;

[0044] (2) Disperse 10 parts of glass fibers with a diameter of 10 μm in 1000 parts of polypropylene melt with a molecular weight of 50000 g / mol, spin it into fibers with a single filament diameter of 35 μm, wind them into an oil guide rope with a porosity of 40% and a diameter of 0.5 mm, and dry it at 80 °C for 36 h to obtain an outer layer oil guide rope;

[0045] (3) Drop 15 parts of tetrabutyl titanate into 60 parts of absolute ethanol at a rate of 2 mL / min, adjust the pH of the solution to 4 with 0.2 mol / L dilute hydrochloric acid, drop 10 parts of 20 wt% ammonium carbonate aqueous solution at a rate of 2 drops / s, stir at 80 rpm for 40 min, transfer it to a reaction kettle, react at 200 °C for 24 h, naturally cool to room temperature, place it in a centrifuge and centrifuge at 8000 rpm for 5 min, collect the solid, wash it alternately with deionized water and ethanol 3 times, and dry it in an oven at 60 °C for 18 h to obtain porous titanium dioxide;

[0046] (4) Mix 60 parts of 60 wt% polytetrafluoroethylene emulsion with 40 parts of absolute ethanol evenly, add 5 parts of porous titanium dioxide and 2 parts of PEG-400 dispersant, disperse it by ultrasonic wave at 40 kHz for 30 min, and filter it with a 5 μm filter screen to obtain a modified coating solution;

[0047] (5) Inject the modified coating solution into a coating tank, place the outer layer oil guide rope on a roller shaft, coat it at a coating speed of 15 m / min, a roll pressure of 0.6 MPa, and a coating thickness of 30 μm, and then cure it at 100 °C for 3 min in a nitrogen atmosphere, and then raise the temperature to 180 °C and continue to cure for 9 min to obtain a modified outer layer oil guide rope;

[0048] (6) Wind the modified outer layer oil guide rope around the periphery of the core layer oil guide rope, bond it at a pressure of 0.6 MPa with a hot press roller at 150 °C at a speed of 10 m / min, cool it for 30 s at a cooling air temperature of 25 °C, a wind speed of 20 m / s, and a wind pressure of 0.3 MPa, and cut it to obtain an inorganic reinforced e-cigarette oil guide rope.

[0049] Comparative Example 1

[0050] The difference between Comparative Example 1 and Example 2 lies in the difference in step (1). Step (1) is changed to: melt-spinning a polyethylene terephthalate solution with a molecular weight of 50,000 g / mol to form fibers with a single filament diameter of 13 μm, winding them into an oil guide rope with a porosity of 70% and a diameter of 3 mm, and drying at 70 °C for 30 h to obtain the core layer oil guide rope. The remaining steps are the same as in Example 2.

[0051] Comparative Example 2

[0052] (1) Disperse 15 parts of nano-aluminum oxide with a particle size of 35 nm and 5 parts of glass fibers with a diameter of 7 μm in 1300 parts of a polyethylene terephthalate solution with a molecular weight of 50,000 g / mol, spin it into fibers with a single filament diameter of 13 μm, wind them into an oil guide rope with a porosity of 60% and a diameter of 3.4 mm, and dry at 70 °C for 30 h to obtain the oil guide rope;

[0053] (2) Drop 10 parts of tetrabutyl titanate into 60 parts of absolute ethanol at a rate of 2 mL / min, adjust the pH of the solution to 3 with 0.2 mol / L dilute hydrochloric acid, drop 10 parts of 20 wt% ammonium carbonate aqueous solution at a rate of 2 drops / s, stir at 80 rpm for 30 min, transfer it to a reaction kettle, react at 160 °C for 15 h, naturally cool to room temperature, place it in a centrifuge and centrifuge at 8000 rpm for 5 min, collect the solid, wash it alternately with deionized water and ethanol 3 times, and dry it in an oven at 55 °C for 15 h to obtain porous titanium dioxide;

[0054] (3) Mix 50 parts of 60 wt% polytetrafluoroethylene emulsion and 35 parts of absolute ethanol evenly, add 4 parts of porous titanium dioxide and 1.5 parts of PEG-400 dispersant, disperse it by ultrasonic wave at 40 kHz for 25 min, and filter it with a 5 μm filter screen to obtain the modified coating liquid;

[0055] (4) Inject the modified coating liquid into the coating tank, place the oil guide rope on the roller shaft, coat it at a coating speed of 10 m / min, a roller pressure of 0.4 MPa, and a coating thickness of 20 μm, and then cure it in a nitrogen atmosphere at 90 °C for 2.5 min and then raise the temperature to 165 °C and continue to cure for 7 min to obtain the inorganic-reinforced e-cigarette oil guide rope.

[0056] Comparative Example 3

[0057] The difference between Comparative Example 3 and Example 2 lies in the difference in step (2). Step (2) is changed to: melt-spinning a polypropylene solution with a molecular weight of 45,000 g / mol to form fibers with a single filament diameter of 25 μm, winding them into an oil guide rope with a porosity of 35% and a diameter of 0.4 mm, and drying at 70 °C for 30 h to obtain the outer layer oil guide rope. The remaining steps are the same as in Example 2.

[0058] Comparative Example 4

[0059] The difference between Comparative Example 4 and Example 2 lies in step (3), which is modified as follows: 10 parts of tetrabutyl titanate are added dropwise to 60 parts of absolute ethanol at a rate of 2 mL / min, the pH of the solution is adjusted to 3 with 0.2 mol / L dilute hydrochloric acid, stirred at 80 rpm for 30 min, transferred to a reaction kettle, reacted at 160 °C for 15 h, naturally cooled to room temperature, centrifuged in a centrifuge at 8000 rpm for 5 min, the solid is collected, washed alternately with deionized water and ethanol 3 times, and dried in an oven at 55 °C for 15 h to obtain porous titanium dioxide. The remaining steps are the same as those in Example 2.

[0060] Comparative Example 5

[0061] The difference between Comparative Example 5 and Example 2 is that step (3) is absent, and step (4) is modified as follows: 50 parts of 60 wt% polytetrafluoroethylene emulsion and 35 parts of absolute ethanol are mixed evenly, 1.5 parts of PEG-400 dispersant are added, ultrasonic dispersed at 40 kHz for 25 min, and filtered through a 5 μm filter screen to obtain a modified coating solution. The remaining steps are the same as those in Example 2.

[0062] Comparative Example 6

[0063] The difference between Comparative Example 6 and Example 2 is that steps (3), (4), and (5) are absent, and step (6) is modified as follows: The outer oil guiding rope is wound around the periphery of the core oil guiding rope, bonded at a speed of 7.5 m / min under a pressure of 0.45 MPa by a hot pressing roller at 135 °C, cooled for 20 s at a cooling air temperature of 20 °C, a wind speed of 15 m / s, and a wind pressure of 0.2 MPa, and then cut to obtain an inorganic enhanced e-cigarette oil guiding rope. The remaining steps are the same as those in Example 2.

[0064] Effect Example

[0065] The following Table 1 gives the performance analysis results of the inorganic enhanced e-cigarette oil guiding ropes of Examples 1 to 3 and Comparative Examples 1 to 6 of the present invention.

[0066] Table 1

[0067]

[0068] From the comparison of the experimental data of Examples 1, 2, 3 and Comparative Examples 1, 2, 3, it can be found that by blending nano-aluminum oxide particles with polyester fibers, a core layer oil-conducting cotton with a low fiber density is made. The structure is arranged loosely, has a high porosity, and can store a large amount of e-liquid, providing guarantee for continuous combustion and effectively alleviating the carbon deposition problem caused by insufficient oil supply. On this basis, a high-density glass fiber oil-conducting cotton is used as the outer layer. By optimizing the fiber braiding density and orientation, while ensuring the mechanical strength, a directional oil-conducting channel is formed, reducing e-liquid retention. At the same time, the e-liquid stored in the core layer continuously penetrates to the outer layer under the action of capillary force and the pressure difference between the inner and outer layers. The outer layer then conducts the oil out at a stable speed according to its own structural characteristics, thus achieving the effects of a large oil storage capacity and a fast oil-conducting speed. Then, by coating the outer layer oil-conducting cotton with a modified coating liquid and bonding it around the core layer, an e-cigarette oil-conducting rope is prepared. The adhesion of the coating liquid is used to realize the integration of the double-layer structure, and at the same time, the outer layer oil-conducting performance is further improved through coating functionalization. From the comparison of the experimental data of Examples 1, 2, 3 and Comparative Examples 4, 5, 6, it can be found that the modified coating liquid forms porous titanium dioxide by doping ammonium carbonate during the hydrothermal preparation of titanium dioxide. It has numerous tiny capillary channels, can adsorb more e-liquid, improve the oil-conducting efficiency, and ensure that the e-liquid can be continuously and stably supplied to the combustion area. At the same time, the presence of ammonium ions can adjust the acidity and alkalinity of the e-liquid, prevent the corrosion of the oil-conducting rope by the e-liquid, and guarantee the service life of the oil-conducting rope. Then, it forms a coating liquid with fluorocarbon resin, increasing the surface area of the coating, enabling the fluorocarbon resin to better penetrate and adhere, enhancing the adhesion between the coating and the oil-conducting cotton, and enhancing the overall mechanical performance.

[0069] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A method for preparing an inorganic enhanced e-cigarette oil guiding rope according to claim 1, characterized in that, It includes the following preparation steps: (1) Disperse 5 - 25 parts of nano-aluminum oxide in 100 - 2500 parts of polyethylene terephthalate melt, spin to make fibers with a single filament diameter of 5 - 20 μm, wind them into an oil guide rope with a porosity of 60 - 80% and a diameter of 2 - 4 mm, and dry at 60 - 80 °C for 24 - 36 h to obtain the core layer oil guide rope; (2) Disperse 1 - 10 parts of glass fiber in 10 - 1000 parts of polypropylene melt with a molecular weight of 40000 - 50000 g / mol, spin to make fibers with a single filament diameter of 15 - 35 μm, wind them into an oil guide rope with a porosity of 30 - 40% and a diameter of 0.3 - 0.5 mm, and dry at 60 - 80 °C for 24 - 36 h to obtain the outer layer oil guide rope; (3) Inject the modified coating liquid into the coating tank, place the outer layer oil guide rope on the roller shaft, coat at a coating speed of 5 - 15 m / min, a roller pressure of 0.2 - 0.6 MPa, and a coating thickness of 10 - 30 μm. Subsequently, in a nitrogen atmosphere, cure at 80 - 100 °C for 2 - 3 min, then raise the temperature to 150 - 180 °C and continue to cure for 5 - 9 min to obtain the modified outer layer oil guide rope; (4) Wind the modified outer layer oil guide rope around the periphery of the core layer oil guide rope, bond at a pressure of 0.3 - 0.6 MPa and a speed of 5 - 10 m / min with a hot press roller at 120 - 150 °C, cool, and cut to obtain an inorganic reinforced e-cigarette oil guide rope.

2. The preparation method of an inorganic reinforced e-cigarette oil guiding rope according to claim 1, characterized in that, The particle size of the nano-aluminum oxide in step (1) is 20 - 50 nm.

3. The preparation method of an inorganic enhanced e-cigarette oil guiding rope according to claim 1, characterized in that, The molecular weight of the polyethylene terephthalate in step (1) is 45000 - 55000 g / mol.

4. The preparation method of an inorganic enhanced e-cigarette oil guiding rope according to claim 1, wherein, The diameter of the glass fiber in step (2) is 3 - 10 μm.

5. The preparation method of an inorganic enhanced e-cigarette oil guiding rope according to claim 1, characterized in that, The preparation steps of the modified coating liquid in step (3) are: Mix 40 - 60 parts of 60 wt% polytetrafluoroethylene emulsion with 30 - 40 parts of absolute ethanol evenly, add 3 - 5 parts of porous titanium dioxide and 1 - 2 parts of PEG-400 dispersant, disperse by ultrasonic at 40 kHz for 20 - 30 min, filter with a 5 μm filter screen to obtain the modified coating liquid.

6. The preparation method of an inorganic enhanced e-cigarette oil guiding rope according to claim 1, characterized in that, The preparation steps of the porous titanium dioxide are: Drop 5 - 15 parts of tetrabutyl titanate into 60 parts of absolute ethanol at a rate of 2 mL / min, adjust the pH of the solution to 2 - 4, drop 10 parts of 20 wt% ammonium carbonate aqueous solution at a rate of 2 drops / s, stir at 80 rpm for 20 - 40 min, transfer to a reaction kettle, react at 120 - 200 °C for 6 - 24 h, cool naturally to room temperature, centrifuge at 8000 rpm for 5 min in a centrifuge, collect the solid, wash alternately with deionized water and ethanol 3 times, and dry in an oven at 50 - 60 °C for 12 - 18 h to obtain porous titanium dioxide.

7. The preparation method of an inorganic enhanced e-cigarette oil guiding rope according to claim 1, wherein The reagent used to adjust the pH is 0.2 mol / L dilute hydrochloric acid.

8. The preparation method of an inorganic enhanced e-cigarette oil guiding rope according to claim 3, characterized in that, The cooling conditions in step (4) are: cooling air temperature 15 - 25 °C, wind speed 10 - 20 m / s, wind pressure 0.1 - 0.3 MPa, and cooling time 10 - 30 s.

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